Drill.



11E FARLEY. v DRILL. APPLICATION TILED DBO. 8, 1909.

973,489, Patented Oct.25, 1910.

6 mm/mk ATTORNEY v THE NORRIS PETERS cu, WAsmnm-ou, n. c,

" UNITED STATES PATENT OFFICE.

FRED E. FARLEY, 0F GREENFIELD, MASSACHUSETTS, ASSIGNOR TO GOOIDELL-PRATTCOMPANY, OF GREENFIELD, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

DRILL.

To all whom it may concern:

Be it known that I, FRED E. FARLEY, a citizen of the United States,residing at Greenfield, county of Franklin, State of Massachusetts, haveinvented new and .useful Improvements in Drills, of which the followingis a specification.

This invention relates to drills and more particularly to the feedingmechanism there- One of the objects of the invention is to providefeeding mechanism' that may be easily adjusted and which may be usedupon moderate priced drills.

Other objects will'be in part obvious and in part pointed out in theclaims.

In the accompanying drawings showing an illustrative embodiment of theinvention, and in which the same reference numerals refer to similarparts in the several figures, Figure 1 is a side elevation of a drillembodying the invention. Fig. 2 is a vertical sectional view of thefeeding mechanism. Fig. 3 is a plan view, parts being removed for thesake of clearness. Fig. 4 is a detailed view in plan showing the upperend of the spool and the star wheel.

In the illustrative embodiment 0f the invention shown in the drawings 1indicates a frame of any suitable construction provided with bearings 2in which a spindle 3 is supported.- The spindle is threaded throughout aportion of its length in the usual manner, as indicated at 4c, and isalso provided at its lower end with a chuck 5 of any suitable type forholding a tool. If desired, a hand wheel 6 may be secured to the upper.end of the spindle as is usual in drills of this character. Motion maybe imparted to the spindle in any suitable manner, as by means of a gear7, meshing with gears 8 and 9, either of which is adapted to beoperatively connected to the spindle 3, the gear 7 being rotated as by ahandle 10. The parts so far described may be of any suitableconstruction and form no part of the invention.

Rotatably mounted within one of the bearings 2, preferably the upperone, is a spool 11 having an interior thread corresponding to, andadapted to engage with the thread of the spindle 3. One of theSpecification of Letters Patent.

Application filed December 8, 1909.

Patented Oct. 25, 1910.

Serial No. 532,083.

pin 18, adapted as the spool rotates to engage the teeth of star wheel19, pivotally mounted upon the frame as by means of a stud 20, the lowerend of which is threaded to engage a threaded opening in the frame, andthe upper end of which is likewise threaded to receive a thumb nut 21.

A spring washer 22 is interposed between the nut 21 and the star wheel19, as clearly shown in Fig. 2, from which it will be understood that byvarying the position of the.

nut with respect to the star wheel, the tension of the spring washerwill be varied and therefore the power required to rotate the star wheelwill also be varied. A suitable casing23 is provided having openings 24and 25 for receiving the spindle 3 and nut 21, respectively, whlchcasing is removably maintained in position, as by a bolt 26 engaging theframe.

The nut 21 is preferably provided with a lower flange 27 upon which amark 28 is placed, which mark is adapted to register with one of aseries of marks 29 placed upon the casing 23, as shown in Fig. 3.Suitable numbers are placed in juxtaposition to the marks upon thecasing, as, for example, the numbers etc. The parts are so adjusted thatby turning the nut 21, so that the mark 28 thereon registers with one ofthe marks 29 upon the casing, the drill will be adapted to operate witha tool having a diameter corresponding to such mark. As

- shown in Fig. 8 for example, the drill is adapted to be operated witha tool inch in diameter.

"The operation of the devicewill now be described.

As the'tool approaches the work, but before it contacts with the same,the friction between the threaded portion 4: of the spindle 3 and thespool 11 will not be sufficient to cause the pin 18 to move the starwheel 19, from which it follows that the spool will be held stationary,thereby causing the spindle to be fed downwardly. When the tool contactswith the work, however, there will be an upward thrust of the spindle,which will cause an increased friction between the threads thereof andthe spool, and when this friction reaches a certain amount, the tensionupon the star wheel will be overcome, thus permitting the spool torotate the same until the pin 18 disengages from the teeth of the starwheel with which it was in engagement. As the pin thus becomesdisengaged, the spool and the spindle will turn in unison with oneanother, thereby rotating the tool, but there will be no downward feedof the spindle. The spool and spindle will rotate in unison until thepin contacts with the succeeding tooth of the star wheel, whereupon themovement of the spool will be checked momentarily, causing a slightdownward feed of the drill, after which, due to the increased frictionbetween the spool and the spindle, the spool will again be released, asabove described. In this manner it will be seen that there is anintermittent feed of the spindle during the operation. After the work iscompleted the drill will be rotated in the opposite direction, the spooland spindle moving together until the pin 18 engages the star wheel. Asthe friction between the spindle and spool is very slight during thismovement, the spool will be held from rotation and the spindle will bedrawn upwardly, thus freeing the tool from the work.

From the above description, it will be observed that the feed isautomatic and easily adjusted, and that there is practically no dangerof breaking the tool, for as soon as the friction between the tool andthe work reaches a certain amount, the spool will be freed from the starwheel, thereby discontinuing the downward feed of the spindle.

Having described the invention in connection with the illustrativeembodiment thereof, to the details of which disclosure the invention isnot, of course to be limited, what is claimed as new and what is desiredto be secured by Letters Patent is set forth in the appended claims.

1. In a device of the class described, in combination, a frame providedwith bearings, a spindle rotatably supported in said bearings andprovided with a threaded portion, a member rotatably supported in one ofsaid bearings and provided with a threaded portion engaging the threadedportion of the spindle, a projection secured to said member, and meansfor engaging said pro jection to arrest the rotation of said member. 2.In a device of the class descrlbed, in comblnatlon, a frame providedwith bearings, a spindle rotatably supported in said bearings andprovided with a threaded portion, a member rotatably supported in one ofsaid bearings and provided with a threaded portion engaging the threadedportion of the spindle, a projection secured to said member and meansfor intermittently engaging said projection to intermittently arrest therotation of said member.

3. In a device of the class described, in combination, a frame providedwith bearings, a spindle rotatably supported in said bearings andprovided with a threaded portion, a member rotatably supported in one ofsaid bearings and provided with a threaded portion engaging the threadedportion of the spindle, a projection secured to said member, and a starwheel rotatably mounted upon said frame and positioned to have its teethengaged by said projection for arresting the rotation of said member.

4. In a device of the class described, in combination, a frame providedwith bearings, a spindle rotatably supported in said bearings andprovided with a threaded portion, a member rotatably supported in one ofsaid bearings and provided with a threaded portion engaging the threadedportion of the spindle, a projection secured to said member, a starwheel rotatably mounted upon said frame and positioned to have its teethengaged by said projection for arresting the rotation of said member,and variable tension means associated with said star wheel, whereby thepower required to rotate the same may be varied.

5. In a device of the class described, in combination, a frame providedwith bearings, a spindle rotatably supported in said bearings andprovided with a threaded portion, a member rotatably supported in one ofsaid bearings and provided with a threaded portion engaging the threadedportion of the spindle, a projection secured to said member, a starwheel rotatably mounted upon said frame and positioned to have its teethengaged by said projection for arresting the rotation of said member, aspring washer engaging said star wheel and adapted to exert pressurethereon, and means for varying the pressure exerted by said washer,whereby the power required to rotate the star wheel may be varied.

6. In a device of the class described, in combination, a frame, aspindle rotatively supported therein and having a threaded portion, amember rotatively supported upon said frame and provided with a threadedportion adapted to engage the threaded portion of the spindle, andautomatically releasable holding means normally holding said memberagainst rotation whereby said spindle will be fed at a rate equal to thepitch of the threads thereon, said means automatically releasing saidmember when the friction between the threaded portion of name to thisspecification in the presence of the spindle and the threaged portioiiof ilshe two subscribing witnesses. mem er attains a re etermine Va uewhereby said member will rotate in unison FRED FARLEY' 5 with saidspindle to prevent further feeding Witnesses:

movement of the latter. CHARLES N. STODDARD, In testimony whereof I havesigned my JESSIE S. BLAOKMER.

